Why do scientists often use melting point and boiling point to identify substances?
Answer:
Melting or boiling point is another property that scientists can use to identify a substance. Melting point is the temperature at which a substance changes from solid → liquid. Boiling point is the temperature at which a substance changes from liquid → gas.
Explanation:
I need help with this
Answer:
The mass and physical structure of the body has changed.
The amount of molecules has changed and formed a new substance.
Explanation:
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Which two changes of state can occur when a substance gains thermal energy A sublimation b depositation c condensation and d vaporization
Answer:
b
Explanation:
Answer:
A and D
Explanation:
I got it on my test
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Answer:
a
Explanation:
just needed the points, sorry
Answer:
I'm confused what is this?
Explanation:
Which type of electromagnetic energy must be used carefully in medicine so it does not damage living tissue?(1 point)
low frequency waves
visible light
radio waves
gamma rays
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, gamma rays is used carefully in medicine without damaging living tissue.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
There are many uses of electromagnetic radiations in medical field. Gamma rays are used to kill the dead cells from e.g. cancer but they don’t destroy the living cells as gamma is only a wave.
Therefore, gamma rays is used carefully in medicine without damaging living tissue.
To know more about electromagnetic wave, here:
https://brainly.com/question/12289372
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Which is NOT needed to START a wildfire.
1. Wind
2. dry debris
3. oxygen
4. unattended campfire
I'm trying to see if I'm correct, I think it's Dry Debris.
Answer:
you are correct
Explanation:
Answer: no oxygen is the wright answer
Explanation:
Because it only helps to burn a fire it does not make fire
1. What is the affect of increasing the temperature of the water?
2. What happens when you add pollution to the water?
3. Can coral survive bleaching?
4. What is coral?
Answer:
1. lower levels of dissolved oxygen due to the inverse relationship that exists between dissolved oxygen and temperature
2. water pollution can cause water to become toxic to humans and the environment.
3. corals can survive a bleaching event but they are under more stress and are subject to mortality.
4. corals are marine invertebrates within the class anthozoa of the phylum Cnidaria.
Answer:
The answer to #1 is the water molecules spread out and move faster.
The answer to #4 is a tiny soft-bodied animal that typically lives within a stony skeleton grouped in large colonies
